style.css
* {
    margin: 0px;/*设置四周边距都为0*/
    box-sizing: border-box;/*宽高的设置值包括border等*/
}

body {
    background: url("42.jpg");/*设置背景图片*/
    background-repeat: no-repeat;
    background-attachment: fixed;/*设置背景图不随网页滑动而改变*/
    background-size: cover;
}
.content {
    perspective: 400px;
    width: 100%;
    height: 620px;
    position: relative;
}
/* 顶部导航条 */
.top {
    overflow: hidden;
    background-color: rgba(0, 0, 0, 0);
}
.top a {
  float: left;
  display: block;/*将链接变为块元素*/
  color: #f2f2f2;
  text-align: center;
  padding: 14px 16px;
  text-decoration: none;/*去掉链接的下划线*/
 }

/* 链接颜色修改 */
.top a:hover {
  background-color: #ddd;
  color: black;
}

/*正中间的字*/
.avr{
    position: absolute;
    display: flex;
    justify-content: center;
    left: 0;
    right: 0;
    top: 10px;
    margin: auto;
    bottom: 0;
    color: rgb(6, 10, 88);
    font-size: 70px;
    font-weight: 500;
    font-family:fantasy;
}

audio {
    position: fixed;
    bottom: 50px;
    right: 0;
}
/* 创建三列 本来是想做三列的，后来没做也懒得改了 */
/* center column */
.leftcolumn {
    float: left;
    width: 10%;
}

.centercolumn {
    margin: auto;
    width: 80%;
    height:1000px;
    padding: 10px;

}
.rightcolumn {
    float: left;
    width: 10%;
}

/* 文章卡片 */
.card {
    background-color:rgba(255,255,255,0.5);
    padding: 20px;
    margin-top: 20px;
    border-radius: 50px;

}
#biaoti {
    text-align: center;
}
#qita {
    text-align: right;
}
/* 列后面清除浮动 */
.row:after {
    content: "";
    display: table;
    clear: both;
}
/*旋转的音符效果*/
.music {
    position: fixed;
    bottom: 50px;
    right: 50px;
    width: 40px;
    height: 30px;
    animation: muscis 5s linear infinite;
}
@keyframes muscis {
    from {
        transform: rotate(0deg);
        opacity: .6;
    }

    to {
        transform: rotate(360deg);
        opacity: .8;
    }
}

.yinyue {
    display: flex;
    justify-content: space-between;
    padding: 0 400px;
    box-sizing: border-box;
    overflow: hidden;
}



/* 底部 */
.footer {
    background-image: linear-gradient(rgba(211, 104, 29, 0.80),rgba(5,72,99,0.80));

    text-align: center;
    margin-top: 50px;
}

/*中间的字效果*/
.btn {
    width: 18%;
    height: 60px;
    position: absolute;
    top: 65%;
    left: 41%;
    background-image: linear-gradient(rgba(211, 104, 29, 0.95),rgba(5,72,99,0.95));
    border-radius: 40px;
    border-color: dodgerblue;
}

.btn p{
        line-height: 60px;
        font-size: 22px;
        color: black;
    }
.bt {
    cursor: pointer; /*使鼠标放上边显示手指形状*/
    width: 25%; /*设置宽*/
    height: 50px; /*设置高*/
    display: block; /*行内元素设置宽高不生效，使用display:block;可以将行内元素设置为块集元素 */
    text-align: center; /*文字在容器中横向居中*/
    line-height: 40px; /*当数值与height一样的时候文字垂直居中*/
    text-decoration: none; /*将文字下划线去除*/
    background-image: linear-gradient(rgba(211, 104, 29, 0.95),rgba(5,72,99,0.95)); /*设置元素背景颜色：渐变*/
    color: rgba(0, 0, 0, 0.60); /*设置文字颜色*/
    border: none;  /*去除边框*/
    margin-bottom: 10px; /*下部外边框距离10像素*/
    margin: auto;  /*使按钮居中*/
    font-size: 20px; /*设置字体大小*/
}
